Multiple-stage air-compressor.



J.G.LBYNER. MULTIPLE STAGE AIB COMPRESSOR.v APPIICJATllON FILED JUNE 14, 1905.

Patented 0G13. 20; 1908.

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- .MHM m lllllllllll J. G. LBYNER. MULTIPLE SXTAGE AIB COMPRESSOR. APPLICATION FILED JUNE 14, 1905.

901,539. Patented oet.20,19os.

5 SHEETS-SHEET 2.

/l M J LG. LEYNER. MULTIPLE STAGE AIR COMPRESSOR. Arrmourolr Hmm JUNE 14', 1905.

Patented oct. 20, 1908.

5 SHEETS-SHEET 3.

J. G. LBYNER.

MULTIPLE STAGE AIB COMPRESSOR.

APPLIOATION FILED JUNE 14, 1905. 901,539, Patented 0ct.2o,1908.

5 SHEETS-SHEET 4.

, J. G. LEVYNER. MULTIPLE STAGE AIR COMPRESSOR.

APPLICATION FILED JUNE 14, 1905.

Patented Oct. 20, 1908.

5 SHEETS-SHEET 5.

5766151966 v p2;?/0377/50 rz' v orw.

` tinuously increasing pressure.

rnrnnrj OFFICE.

JOHN GEORGE LEYNER, OF DENVER, COLORADO.

` MULTIPLE-STAGE AIR-COMPRESSOR.

speciacation c: Letters Patent.

Patented Oct.`20, 1908.

Application filed June 14, 1905. Serial No. 285,267.

To all whom 'it may concern:

Be it known that I, JOHN GEORGE LEYNER,

va citizen of the United States of America, re-

siding in the city and county of- Denver and State of Colorado, have invented a new and useful Multi le Stage Air Compressor, of which the fo owin is a speciiication.

Myinvention re ates to a new type of air compressonand the objects of my invention are: First, to produce an air compressor that will compress air in successive sta es of conecond, to rovide a multiple sta e air compressor. hird, to produce a mu tiple cylinder and multiple stage air compressor. Fourth, to

produce a multiple cylinder and piston rotar air compressor. Fifth, to provide a mu tiple cylinder and multiple rotary piston air/compressor. Sixth, to provide an air compressor having a' plurality of cylinders of diiferent areas, containing multiple pistons of different areas. I attain these objects by the mechanism illustrated in the accompanyin drawings, in which:

igure l is a longitudinal vertical section through the axial center of my multi le stage air compressor... Fig. 2 is a central orizon- :tal sectional view of my multiple cylinder air compressor. Fig. 3 is an end elevation of the front end 'of my new air compressor. Fig. 4 is a vertical, transverse section of Fig. 2 .on

'line 1l-#4.' j' Fig. 5 is a similar view-of Fig. 2

on line 5-5. Figs. 6, 7, and 8 are views, on

a reduced scale, of the partition plates be-l tween the cylinders, and Fig. 9 1s an'iend 'elevation of the rotary piston shaft.

Similar letters of reference refer to similar `parts throughout the several views.

Referring to the drawings, my improved air compressor consists of a plurality-of independent casings, 1, which are provided with 4air compressing cylinders or com artments, 2, 3 ,i and 4, respectively,to ywhic are secured a front cylinder head, 5, Aand a rear cylinder head, 6. These two cylinder heads are provided with su porting base portions, 7 and 8, respectiyelpy. The cylinders are separated from one another by partitions 9 and 10, and the rear-cylinder head is separated from the cylinder 4 by a partition 11.

The sides of the cylinders and of the partitions, andthe sides of the .cylinders joining the adjacent sides of the front :and-rear cylinder heads, aregmachine iinishe'd to fit air land steam tight ito'gether, side byside, :and

are-secured in direct -alinement with one anball bearin s are prefera .y other by dowel pins, 11A, which are tted in holes inthe artitions and in the .joinin sides of the outside cylinders and the cy der heads, and the'cylinder heads are also provided with rejecting lugs, 12, which are'provided with olt holes and are bolted together into onesubstantially integral air compressing machine, by bolts .14. These independent air compressing c linders are of diiferent lengths, that is, ara lel with their axes, 4the length of each re ativ'e to the others being determined by the proportional area desired to be attained in each. independent cylinder, and the relative areas required to attain the ratio of compression desired in any particular size of air compressing machine. These three casin s are bored out to form cylinders of preferably the same diameter. dependent casings, and their cylinder heads, are all. preferably made round, and of the same external diameter, and in each casing between its inside diameter and the outer peripheral surface of its cylinder, I form a water cooling space, 15, and the water cooling spaces of the several casings are connected'by holes, 16, formed in the partitions 9 and 10. (See Figs. 4 and 5.)

In the casing of the large cylinder I form two rows of spokes, 17, which extend from i These inmounted in axialapertures 211 and-22,'formed in -the lfront and rear cylinder heads, and in a ertures 23 and24` and 24A, formed through 2t e partitions 9 and 10 and 11. The larger diameter ofthis piston'shaft fits rotatably in theaxialzapertures 23-and 24 and 24H-formed .in vthe lpartitions 9 and 10 land 11, fandcxtends throughall of fthe cylinders `into counter-bores 25-and 26, formed in the front and rear cylinder heads. Two smaller counterbores, 27 and 28, lare formed inthe front and rearcylinder heads, :and intersect the `counter-bores 25 and 26, in which ball bearings, 29 Aand 30, :arefrespectively formed. These b y formed bytwo concentric y-farrangedrings, 31'amd 32, and

33-and 34, which have :formed partially 2in each `and between them circumferential ball races in which a circumferential row7 of balls 37 is laced. The rings 31 and 32 are seated tight y on the opposlte ends of the piston shaft adjacent to its enlarged portion, and the rings 33 and 34 are seated in the counterbores 27 and 28, opposite to and in operative relation to therings 31 and 32, to form a race- Way between themfor the row of balls 37.

The front end of the piston shaft extends beyond the adjacent ball bearin through and beyond the adjacent end o the front head, and a thin renewable sleeve 38, of any metal suitable for a wearing surface, is fitted tightly on it. This sleeve extends from near the end of the piston shaft to near the adjacent ball bearing, .and forms a renewable Wearing surface on the shaft, and a hollow collar 39 is placed loosely on the shaft, andl the sleeve, close against a hub ortion 40, formed on the front cylinder hea in which the counter-bore 27, having the ball bearing 29 of the iston shaft, is formed. This collar is securecrl to the hubA by cap screws 41, shown in Fig. 3, which extend through lugs 42, formed on the collar, and screw into the hub of the cylinder head. The side of the collar adjacent to the hub contains an'annular Waterchamber 43, that extends into the collar to near its op osite side, and surrounds the piston shaft. he joint between the-hub and shaft inside of the collar, is packed by a upped leather or rubber packl ring 44, which is clamped against'the hulligby a ring,

45, secured bv screws, whichare threaded tor -'the hub. T e joint between the opposite side of the collar and the shaft, is also packed- .n by a cupped leather or rubber washer, 47,

which is also secured by al ring 48, which is screwed to the inside wall of the water cham- 'ber in the collar, to bear against the shaft. This Water inlet collar is provided with a threaded water inlet aperture, 49, to Which a pipe -or hose 50 is connected that leads to a sup ly of water under-pressure. These tWo pac ing rings prevent any objectionable eakage of water from the Upon the piston shaft,- at the side of thev vwater inlet collar, I mount on the sleeve'a Water outlet collar, 51, which contains an 54. These flanges extend to close to the ves a erture through it much larger ..than. the s aft, and is also provided with a `Water chamber, 52. To both vsides of this collar, sheet metal flanges, 53, are secured by screws shaft, and are curved inward to form an introverted lip on each, and uy on the sleeve of the shaft two rings 55 'an 562-aref formed, that contain flanges 57 and 58, the-peripheral -edges of which extend aboye the curved lips of the collarsA flanges, and are turned over the edges of the lips, thusv forming a joint that will prevent v'objectionable leakage of wter from the collar around the shaft.v This collarV center.-

water lnleti collar' ture 75, formed in the front end of the ,s

head to support the water outlet colar on the shaft' at the. outside of .the water inlet.v The bottom of the outlet collar is rovided with an outlet a erture, 62, to Whic a Waste pipe 63 is threa ed.- The extreme end of the 4piston shaft is provided with key-ways, 64,

to enable.a transmitting device to be securely fastened to its end to drive the air compressor by either steam or electric or Water power. I do not illustrate any of thesepower transmittin devicest connected to the end of the piston s aft, as they do not form a part of my invention. The forward end of the piston shaft is provided with a water inlet aperture,f65,ewhich is formed in the side of t e'shaft within the water inlet collar.

axial aperture, 66, w 'ch extends into the .end of the shaft at one side of its axial center, and connects With a Water chamber 67, formed in the enlarged part of the piston shaft This inlet a erture intersects an at one side of its center (see Fig. 4.) This chamber extends 'through thekenlarged part of the piston shaft, and connects with an aperture 68 that is drilled axially intothe rear end ofthe shaft at one side ofits axial The entrances to the a ertures 68 and66 at the of posite ends of t e piston shaft, are threa ed and plug ed up by short threaded plugs 69`and 70. l his aperture 68 intersects an aperture 71, formed transversely through the rear end of the piston shaft, the entrance of which is threaded and plugged up by a screw plug 72. This transverse aperture 71, intersects an aperture 73, that extends into the rear endo'f the shaft on the opposite side of the center of the shaft from t e aperture 68, but lsubstantially parallel with it. This aperture 73 connects with a chamber 74,

lformed in the opposite side of the 'enlarged part of the piston shaft from the chamber 67, and the chamber 74 co"nnects With an ape;-

a t on the opposite side of its axial center from the .aperture 66, and substantially parallel with-Ait. v'lheentrance ends of the apertures 73 and 75 are. threaded and plugged by threaded plu s 76 and 77,. The aperture 75 is intersecte by a transverse aperture 78,

which extends into the shaft within the outv let collar! The entrancetothis a erture78 is threaded vanda short tube 79, W 'ch- I'call the dischar e tube, is threaded to it. The

water-l su p y enters the inlet collar, 39, through t e hose y50, from a source of cold water supply .under pressure, and fi'cws through-t e apertures 65 and 66 into :chamber 67, thence throughapertures 6,8, 71 and 73, intov chamber 74, andthrough a erture 75 andfthe tube 79, fromfwhich itl charges pressure.

against the inner .periphery of the collar 51, and flows out of' it through the discharge tube 63, to waste, thus keeping the piston shaft cool.

,An aperture 80, is formed, preferably .through the lower part .of the front head,

which is threaded to receive a pipe or-hose, that leads to a supply of cold water under The water flows into and fills the circumferential spaces surrounding the cylinders, flowing fromsone to the other through theapertures 16, in the artitions 9 and 10, through an aperture 81 Vin the plate' 11, and out through a discharge aperture 82, formed preferably in the top part of the rear cylinder head 6. This discharge aperture is threaded, and a pi e 83 and elbow 84, is threaded to it, and lea s the water to waste. The cylinders are thus completely surrounded continuously by cold runnin water. The front cylinder head is provide with an air inlet a yerture 85,'

' Aand the rear cylinder head is provided with a compressed air outlet aperture 86, which l referably arrange in the following manner: he air inlet 85 is formed in a depending lug ortion 87, formed .on the lower side of the fhib of the front cylinder head, and it enters the large cylinder 2 at its lowest part, While the compressed-air outlet 86 is also formed in,

a projecting lu 88, that is cast on the cylinder head, 6. he first or large cylinder 2, is connected with the second cylinder 3, by means of air ports, 89, 90, and 91, in the partition 9, that divides the large cylinder 2 from the middle cylinder 3. l preferably use three' air discharge ports in each cylinder,

' but more or less than three ports may be used if desired, and l place the three ports of the initial cylinder 2, directly above the piston shaft, the first port 89, being v'directly above the axial center of the shaft, the secondport,

90, a short distance beyond, and the third port 91, between the port 90 and the point ofthe wed e-shaped space vformed between the piston s aft andthe cylinder.

Thepiston shaft cuts slightly into one side ofthe inner riphery of each of the cylinders 2, 3, an 4, las shown, in order to closethe space between the piston'lshaft and-the adjacent oi-nts of the cylinders, and thus provide 4a ong bearing which will revent .the

escape of air between them. he' middle cylinder 3, discharges its compressed air through three orts 92, 93, and 9.4.y :These ports fare place inthe bottom offthepartition 10, 4'and in the same relative positionxto the touching oint'of thepiston shaft and the` middle cy inder asthe. orts are'in 4the lar .e cylinder 2, and the cy 'nder `4, which ism line with the cylinder 2, and discharges its compressed airthrou-gh-three ports v95, "96,

and .97,.formed in the (partitionfll at'thetop bf the cylinder 4, an in the same relatiye position and-directly in line with'the: air dis- :e5y charge ports 89, gaand si, @f the langem? ischarge outlet 86.

initial cylinder. The `discharge passage of the cylinder 3 is placed at the ottom of the .partition 10, as owing to the eccentric position of this cylinder to both the piston shaft and to the other two cylinders, as it is placed on the op osijze sideof the piston shaft from the cylindrs 2 and 4, the wedge space of this cylinder is positioned at the bottom of the cylinder 3, and the air of this cylinder is compressed at the lowest part of it, while the air .is compressed at the top of the cylinders 2 and 4. 'The eccentric arrangement of these three cylinders to the piston shaft, forms a progressively decreasing wedge-shaped space in the path of the pistons, in which the .air is compressedby therotating movement of the pistons, as will be described hereinafter. The partition 11, is placed between the rear cylinder head and the cylinder 4, and at the side of this partition i secure to the piston shaft and at diametrically opposite points on its surface, in suitable recesses 98, by screws 99, two projecting blades 100 and 101, which I term slide valves. These slide valves rotate with the piston, and in contact with the adjacent side of the partition 11, and cover the compressed air discharge ports, and they are preferably arranged to roject into a recess 102 formed in the cylind slide Valves are independent of each other, and they each comprise a'sliort blade of steel or other suitable metal, each of which is in length about a fifth of the circumference of the iston shaft, and they act as slide valves to cfose the discharge apertures 95, 96, and 97, in alternate order, their function being to close these discharge orts and .prevent the air already compressed and in the discharge outlet 86, from flowing back into the cylinder, except whereair is compressed in the cylinder 4, at the point of these ports to the saine or to greater pressure than that in the discharge pipe, when these valves owing Ato the rotation of the piston pass away from the orts, and the air flows through them intothe d The enlarged part of the piston shaft that lies in each cylinder, is provided with piston slots 103, 104, and 104A which are formed diametrically through the centerI of the piston shaft between the water chambers? and 74. These iston slots each extend the entire length' o each cylinder, and in them I lace pistons 105, 1052" and 105B, 'each of w ich consists of a blade of `metal which is constructed in twoe u al halves, and'is arranged to yieldingly an ref silientlyexpand and contract to fill the ec? er head. These the edges of the shoulders, 108, and inthe ends, 1107, I formholes -109 and 110, in each half,,and arrange thezmirin pairs to: register op- 'tive cylinders, a sma posite each other, and in each two oppositely arranged and registering holes, I place a coiled expansive' s ring 111. I preferably place' Ifour pairs of jholes in the large piston, near its opposite side ends, and two in the center of the smaller pistons. These springs by their ex ansive resilient pressure, force and hold tlie two halves of.. each piston against the inner peri hery of their respecclearance space 112 being provided between the half parts of each piston to permit them to be compressed slightly smallerv than the cylinder lto allow them to be easily inserted in the cylinders, and each piston slides reciprocally in its respective recess, and expands and contracts, as it rotates through the varying orbit of its revolution, owing to the eccentricity of its' cylinder to the axis of the iston shaft.

The operation is 'as foA lows: The piston shaft is rotated by steam, electrical, water or any other suitable motive po'wer machinery, which is connected to the cross slots in the end of its shaft, andthe pistons are rotated with the piston shaft, and as they rotate they expandland contract, and keep in bearing contactI with the innerperipheral surface of their respective cylinders. As they rotate' in the direction of the arrow, 113, air flows into the initial cylinder 2, through the air inlet a erture 85 -in front of the piston 105, whicff pushes it in front of it and compresses it as it moves upward and over, as the piston forces the air into the decreasin wedgesshaped space to the point where t e piston into the cylinder 3, and after the piston 1 ()5 rotates in operative bearing contact with the, inner peripheral surface of the cylinder,'and' when the piston 105 ap roaches the air dischargeports'89, 90, an 91, a portion of the air flows through the discharge aperture 89 passes the discharge port 89, the compressed air in the Inarrow wedge space is forced through the discharge aperture 90 into the cylinder Stand after the pistonpasses the port 90, practically all of the remamingcompressed air in the remainin very narrow tapering point of the wedge-s aped space is forced into and throu h the discharge. aperture 91, into the cylin ingl between the piston shaft and the inner periphery of the cylinder formed by the curved recess, prevents practicallyv any air p next cylinder.

vfrom'escaping from the narrow wedge space except through the air escape ports into the The cylinder is positioned in the same'eccentric relation to the piston shaft as the cylinder 2, but on the opposite side of the iston shaft from theI cylinder 2. Consequent y, its ,piston 105A, which is mounted in the piston shaft in the same rela- Vtive plane, 'and in direct alinement with it,l andfmoves in. unison with it, catches andv pushes thecompressedair asitV is forced from the cylinder 2 through that cylinder s air diser 3, as the long bearcharge ports, and pushes it vahead of it, around to the discharge ports 92, 9 3, and 94, in the partition 10, at the end portion of the decreasing wedge-shaped s ace formed at the lower side of this cylinder etween it and the iston shaft, and further compresses it and orces it through the air ports 92, 93, and 94, into the cylinder 4, the piston of Which catches it and pushes it up and around exactly like the piston of the cylinder 2, and again further compresses it in the wedgeshaped space at the top of this cylinder, forcing it throu h the apertures 95, 96, and 97, into the disc arge aperture 86, which leads to a compressed air receiving tank or conveys .it to use. The forward end of the slide valves 100'and 101, of the piston shaft, are arranged opposite to the piston, and when the piston o the cylinder 4 passes the ports 95,96, and 97, the forward end of .these slide valves slides over them and closes them so that the com ressed air that has been forced into the disp arge outlet 86, can not iiow back into the cyllnder 4, and as the piston shaft isl partition, within the inner surfaces o the adjacent cylinders.

2.4 In an air-com ressor, a plurality of cylinders arranged end to endbut out of alinement, a artition between the vends of adjacent cy inders, a rotary piston in each cyl- Inder, and a plurality of4 ports of different the inner sur aces of the adjacent cylinders.

8. In an air-compressor, a pluralit of connected cylinders arranged end to' e but out of alinement, va rotary piston in each cylinder,

' size extendin through each partition, within an outlet from one end cylinder, and a revolvin'g valve for said outlet.`

4.. In an air-compressor, a lurality of 'connected cylinders arranged en tudinally through said cylinders, an out et from one end cylinder, and rotary pistons for said cylinders and a valve for said outlet,

carried by said. shaft.

to end but' vout of alinement, a shaft extending lon 5. In an air compressor, the combination of the cylindrical casings having eccentricall arranged cylinders therein, the piston sha rotatably mounted said casings and cylinders in rotary bearing contact with one point of the inner periphery o f said cylinders,

water circulating'passages 1n said casln s surrounding said cylinders, and a suitab e Water inlet and outlet in said casing into and w consce outf of said water passages, water circulating passagesinsaid piston shaft, a water-'inlet aperture in said shaft connecting with one end of said passages and a Water outlet aperture-in said' shaft `connecting with the opposite end of said water passages, as set forth.

6. In an air compressor, thecombination of the piston shaft, the casing having cylinders arranged eccentric to said piston'shaft and cooling spaces surrounding said cylinders, with air cooling passages in said piston shaft,

4arranged to receive a supply of cold Water, la

.outlet aperture in said hood, and means, in-

cluding cupped Washers, for packing the 'oints between said Water inlet and outlet oods and said shafts, as set forth. 7. An air compressor, a rotary piston shaft, three eccentric cylinders each of a different predetermined len th and area arranged to support said s aft and to bear against a point of their inner peripheral surfaces, two of said cylinders being arranged 4to bear. against one side of said piston shaft and the third cylinder being arranged to bear against its opposite side, a front and rear cyl- Ainder head for said cylinders, a partition bet e largest cy tween saidcylinders and also between said rear cylinder and said rear cylinder head, means for securing said cylinders and partitions'and cylinder heads together, a piston in each cylinder slidably mounted in said piston shaft and arranged to adjustably engage at their op osite ends the inner eriphery of each of sald cylinders, an air-in et port through the front cylinder head into/the largest cylinder, means for rotating said piston shaft and pistons to compressair in each linder, air ports in the partition between inder and the next largest cylinder positioned toconvey the compressed air from the largest cylinder into the next largest cylinder, air ports in the partition between the4 next smallest cylin er `and the Y shortest cylinder positioned and arranged to convey the com ressed airfrom the second largest cylinder into the shortest cylinder, an air dlscharge port 1n the rear cylinder head,`

air po'rts positioned in the artition between the smallest cyllnder and t e discharge port of the rearcylinder head positioned to convey the compressed air from the-shortest cylinder into the discharge port, and havingl said istons arranged to prevent the back ow o air from the second argest. to the largest, and

from the shortest to the second largest cyll provided With a suita index', and a means. for intermittently closing the discharge ports of said shortest cylinder to prevent the back flow of compressed air from the discharge ports into the shortest cylinder, Water passages in said iston shaft le water in et a .erture arranged to connect to a supply of col water, and a suitable Watery discharge outlet, Water holding space's surrounding said cylinders and connected together to form a continuous passage for cold-Water from the water holding space of each cylindertov the other, a Water inlet aperture at one end of said cylinders adapted to be connected to a'supply ofcold Water, and a Water discharge aperture at the opposite end of said cylinders, as s et forth./

8. In an air compressor, the combination y'With the cylinders and "their surrounding casing, the cylinder heads, andthe piston shaft, and the ball bearings mounted therein',

of the iston shaft mounted in said ball bearings, tiie Water passages in said piston shaft, the Water inlet hood secured to said cylinder head and surrounding said piston, thewater inlet aperture in said shaft connecting With said Water passages, the packing rings secured toI said hood and surrounding` said shaft, the Water. outlet aperture in said shaft l connected With said Water passages, the hood blades secured circumferentiallyl to said piston and arranged on o posite sides of 1t to extend a predetermine Idistance around it, and to form an alternating projecting blade valve portion, and a space portion vbetween said. blade portions of predetermined extent, and arranged to alternately open and close said air discharge outlet from said cylinders, as set forth.

10. In an air compressor, the combination ofthe cylindrical casings, and the cylinder,

and the iston shaft andpistons, of a sleeve mountedp on said piston shaft, Water passages in said piston, a Water inlet aperture into the Water passages of said iston shaft through said sleeve, a Water out et aperture insa/id piston shaft through said sleeve, and a Water inlet hood and a Water outlet hood mounted on said sleeve, and piston shaft,

and secured to said cylindrical casings, and,

means for packing said hoods on said piston shaft against leakage, as set forth.

11. In an air com ressor, the combinationA with .the cylindrica casings, having the eccentric cylinder therein, the-water circulating air cooling chambers, the partitions be'- tween the cylinders, and the cylinder heads, with the piston shaft and pistons rotatably' mounted in said cylinders inoperative airl se CY compressing .relation to said eccentrically determined distance, and Darranged to a ternately open and close said air discharge port in unlson with the ofpei'ative air compressors rotary movement o said pistons, in said cylinders.

cylindrical casings, secured together, and arated from each other by partitions, a der formed eccentricall in each casing, of three diferent lengths, t e outside cylinders of said casings bein arranged inv alinement with each other an being res ectively the largest andthe smallest cylin ers, and the. center cylinder being arranged in the opposite side of its casing from the cylinderso the houtside casings, cylinder heads secured to the outside casings, a rotary shaft mountfed in said cylinder heads and arranged to hear in rotary contact at one point ofthe inner peripheral surface of said cylinders, an

expanding and contracting compensating .12. An air compressor, comprising' three vp piston.- I' slidably arranged diametrically through said plstonish'aft in each cylinder and arranged to rotate in bearing contact with theiinner peripheries of said cylinders,

means for rotating said piston shaft, andA pistons, an air inlet port' into the largest cylinder, air ports arranged in the Ipartition se arating this end cylinder from t e center cy inder, to permit the air compressed in this end cylinder to llow into the second or middle cylinder, orts arranged in the partition separating t 's center cylinder from the smallest cylinder to permit the air compressed in the'center cylinder to How into the smallest end cylinder, a partition between said small cylinder and its adjacent 'cylinder head, a compressed air discharge portin said cylinder head, air discharge orts in said partition registering with' said cylinder head-s air discharge port, arranged .to-permit the air compressed 1n the smallest cyhnder tofloW into the 'discharge ort of s aid cylinder head, means, 'inclu ing rotary blades attached to said piston shaft for said discharge port -into said small cylinder,

and from one cylinder back 'into the other' lar er cylinders, as set forth.

JOHN GEORGE LEYNER-` Witnesses:v

JOHN A. FARWELL, CLARENCE LAWSON.

vn .testimony whereof I aix my signature in presence of two Witnesses.

.preventing the air from flowing back from 

